Limit count of users for Photon Server

Hello. With Photon Cloud, we have CCU limit, that is controlled with subscription.
Is there a way to limit concurrent users that can connect to dedicated Photon Server? We want to control stability of servers, by reducing count of players on one server.
If it is possible, how it is behaved when servers use MasterServer?
Is there maybe a way to setup max CCU or max users/rooms count for Photon Server?

Thanks!